JP2691340B2 - Pipe liner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

INDUSTRIAL APPLICABILITY The present invention is used for lining the inner surface of a pipeline mainly buried in the ground, such as a gas pipeline, a water pipeline, a sewer pipeline, a pipeline for laying power lines and communication lines, and an oil pipeline. The lining material, in particular, is formed by forming a flexible airtight layer on the outer surface of a tubular fiber layer, impregnating the fiber layer with a curable resin, and turning it over with fluid pressure. A lining layer is formed on the inner surface of the pipeline by inserting the lining material inside the pipeline and crimping the lining material inside the pipeline with the fluid pressure to cure the curable resin and adhering it to the inner surface of the pipeline. The present invention relates to an inner lining material suitable for application in the method described above, and also to an inner lining material capable of forming a strong tube in a duct by the lining layer itself when the curable resin is cured.

[0002] In the past, the lining of pipelines has been performed for the purpose of closing damaged portions of aging pipelines and preventing leakage of internal fluid. In this case, the lining material was required to have air-tightness and water-tightness, but the strength and rigidity of the lining material itself were not so much a problem, as long as the pipeline was broken for any reason. It was naturally considered that the lining layer on the inner surface was also broken.

However, in recent years, there have been accidents in which pipelines such as water pipes and sewer pipes are broken due to ground subsidence or vibrations of passing vehicles, and a large earthquake is expected to occur in some urban areas. In addition to repairing old pipes, new pipes are also lined preventively in case pipes break due to earthquakes or vibration.

That is, another pipe is formed in the pipe line by the lining layer, and a so-called pipe-in-pipe structure is adopted. Even when the pipe line is destroyed by an external force, the lining layer is still alive. While preventing leakage of internal fluid,
For the time being, it is required to be able to secure a flow path.

In such a structure, first, when the outer pipe is broken by an external force, the inner lining layer is peeled off from the pipe without being broken, and absorbs energy, thereby absorbing gas and water. It is required to have a so-called seismic isolation property that prevents leakage of internal fluids such as water and sewage water and secures its flow path. Thus, the situation in which the pipeline is destroyed is mainly cracks and breakage in the circumferential direction of the pipe and detachment of the joint portion, which has sufficient strength in the length direction as the lining material, and is about 10 to 20%. It is required to have an elongation of.

Next, when the pipeline is destroyed by an earthquake or the like, external groundwater and earth pressure directly act on the inner lining layer, so that it has sufficient strength to withstand groundwater and earth pressure. External pressure retention is required. Thus, this external pressure shape retention largely contributes to the bending elastic modulus in the circumferential direction of the lining material forming the lining layer. The larger the bending elastic modulus, the better the external pressure shape retention.

Further, when the pressurized fluid is sent into the pipe, it is necessary to have a pressure resistance enough to withstand the internal pressure. Further, it is desirable that the coefficient of radial expansion due to the internal pressure is small. If the diameter expansion coefficient is large, the destruction of the pipeline that has already been destroyed will proceed, and the diameter will fluctuate due to pressure fluctuations, moving the surrounding soil and forming voids around it. , Not preferable.

In addition, it is extremely rare that the pipe lined inside is entirely composed of straight pipe portions, and usually has curved pipe portions such as bend portions. For example, a bend portion of a gas pipe having a diameter of 150 mm has a radius of curvature of about 400 mm, and the length of the bend portion outside and inside is about 1.5.
There is about a double difference. Therefore, in order to line such a pipe line, it is required that the lining material be highly stretchable in the length direction.

[0009]

2. Description of the Related Art As a lining material which is highly stretchable in the length direction, for example, Japanese Patent Laid-Open No. 59-194809 and Shokai Kai 6
Those described in, for example, 0-132323 are known. These are those in which an airtight coating layer is formed on the outer surface of a tubular woven fabric, and as the warp yarn of the tubular woven fabric, polyurethane elastic yarn is wound with synthetic fiber yarn such as polyethylene terephthalate fiber. A thread, a polybutylene terephthalate fiber thread, or the like is used.

Since the warp threads in these structures are highly stretchable, the warp threads in the portion along the outer side of the bend tube can be extended in the bend tube portion, and are suitable for the conduit having the bend tube portion. Can be lined with.

[0011]

However, in this type of lining material, when the tubular woven cloth is stretched in the lengthwise direction, the weft thread spacing is increased by that amount, and the weft thread density becomes coarser, resulting in a tubular shape. The pressure resistance of the woven fabric is reduced.

For example, in the bend portion of the pipe line, when the weft density of the portion along the outer side becomes coarse and the pipe line is broken and the lining material is peeled from the pipe line, the lining of that portion The material stretches and the weft density of the tubular woven fabric becomes coarse.

When the weft thread density of the tubular woven fabric is partially roughened, the pressure resistance of that portion is reduced and the inner pressure easily swells. Therefore, in the case where the pipeline is damaged, the damaged portion may act to spread it from the inside, and the damage may progress. In addition, the external pressure shape retention is also reduced,
When groundwater pressure or earth pressure is applied from the outside, it cannot withstand these external pressures and may collapse.

It is also possible to make the density of the weft threads of the tubular woven fabric dense in advance so that sufficient pressure resistance and external pressure shape retention can be ensured even when the tubular woven fabric is stretched in the longitudinal direction. It is conceivable that if the weft threads are made dense, the warp threads will be woven in a stretched state to some extent, impeding the contractility of the tubular fabric and losing the significance of using highly elastic yarns for the warp threads. Will end up.

Further, as shown in JP-A-59-225921 and JP-A-59-225920, by increasing the thickness of the fiber layer in the lining material, shape retention is ensured and radial expansion is suppressed. However, if you try to secure the stretchability in the length direction only by the thickness of the fiber layer, the flexibility of the lining layer will decrease and a large fluid pressure will be required for reversing, making the lining work difficult and Due to the fluid pressure, the warp yarns are elongated and wrinkles are generated in the bend portion, and seismic isolation cannot be ensured when the pipeline is broken.

The present invention has been made in view of the above circumstances, in which the lining layer does not become thicker than necessary, and various performances such as seismic isolation, external pressure retention and pressure resistance required for the lining material are provided. It is an object of the present invention to provide a liner lining material which has the above-mentioned characteristics and which has a small radial expansion and which can be appropriately lined in a curved pipe portion of the line.

[0017]

SUMMARY OF THE INVENTION According to the present invention, a yarn having high elasticity is used as a warp yarn, and the warp yarn and the weft yarn are woven in a tubular form to form a tubular woven fabric, and the tubular woven fabric is lined. In this state, an airtight layer of rubber or synthetic resin is formed on a surface corresponding to the inner surface, and a warp yarn made of highly elastic yarn and a high-rigidity fiber yarn are formed on the side of the tubular woven fabric that should face the duct. It is characterized in that a tubular woven fabric formed by weaving a weft yarn into a tubular shape is fitted.

The invention of claim 2 is characterized in that, in the lining material, a tubular nonwoven fabric is fitted between tubular woven fabrics and tubular woven fabrics.

In the invention of claim 1 or 2,
The weft thread of the tubular woven fabric is preferably sufficiently thicker than the weft thread of the tubular woven fabric.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a lining material 1 of the present invention. The lining material 1 has an airtight layer 3 of rubber or synthetic resin formed on the outer surface of a fiber layer 2.

FIG. 2 shows an embodiment of the invention described in claim 1 of the present invention. In the fiber layer 2 of the lining material 1, a tubular woven fabric 12 is fitted inside a tubular woven fabric 6 composed of warp threads 4 and weft threads 5.

As the warp thread 4 of the tubular woven cloth 6, a highly elastic material is used, and a synthetic fiber thread such as a polyester thread is wound around an elastic thread such as a polyurethane elastic thread. Is preferred.

As the elastic thread, a rubber thread or the like may be used in addition to the polyurethane elastic thread. However, since the rubber thread is easily deteriorated by ultraviolet rays or heat, polyurethane is more suitable. Further, the synthetic fiber yarn wound around the elastic yarn enhances the shrinkage force of the warp yarn 4, and a crimped yarn may be used in addition to the synthetic fiber filament yarn or spun yarn.

It is also preferable to use polybutylene terephthalate fiber yarn as the warp yarn 4. The polybutylene terephthalate fiber itself has an elongation at break of about 30%, and is particularly rich in elasticity among synthetic fiber yarns, and is suitable as the warp yarn 4 in the present invention. Further, by using the crimped yarn of polybutylene terephthalate fiber, the stretchability can be further enhanced, which is more preferable.

As the weft thread 5 of the tubular woven cloth 6, high rigidity fiber thread, polyester fiber thread, or the like can be used.
Examples of the high-rigidity fiber include glass fiber, carbon fiber, metal fiber, aramid fiber, wholly aromatic polyester fiber, and ultra-high degree of polymerization polyethylene fiber.

When the liner is lined with this lining material 1, the fiber layer 2 is impregnated with a reaction-curable resin, and an epoxy resin is most widely used as the reaction-curable resin. Therefore, the weft thread 5 has excellent affinity with the epoxy resin,
It is preferable to use epoxy resin as a matrix to form a composite material having a large elastic modulus, and glass fiber or polyester fiber is preferable.

When polyester fiber yarn is used,
A crimped yarn is preferable, and it is also preferable to use a mixed twisted yarn of a polyester fiber filament yarn and a spun yarn or entangled long fiber yarn. Further, as the weft thread 5 of the tubular woven cloth 6, it is possible to use a thread having high elasticity like the warp thread.

When glass fiber is used as the weft yarn 5, the diameter of the single fiber is preferably 6 μm or less.
The tubular woven fabric 2 of the lining material 1 is woven and then folded flat to be handled, but if the diameter of the single fiber is large, the fiber is easily broken at the folding ear portion, which is not preferable. Also, when inserting into the conduit while turning it over, by using monofilaments having a small diameter, the lining material is flexible and it is easy to turn over, and it is possible to advance the turnover with low pressure.

When a high-rigidity fiber yarn is used as the weft yarn 5, it is preferable that it is bulked. Since the tubular woven fabric 2 needs to be sufficiently impregnated with the reaction-curable resin, it is desirable to use a fabric that is bulked by disturbing the high-rigidity fiber with an air jet or a steam jet.

As the weaving structure of the tubular woven fabric 2, an appropriate structure can be used, and a plain weave, a twill weave, a ridge weave and the like are suitable.

The tubular fabric 12 is also a warp yarn 1
3 and weft thread 14 are woven in a tubular shape. The warp threads 13 of the tubular woven fabric 12 are made of a highly elastic yarn like the warp threads 4 of the tubular woven cloth 6, and the weft threads 14 are high-rigidity threads. As the high-rigidity yarn, glass fiber is suitable as in the case of the tubular woven fabric 6. As the weft thread 14, it is preferable to use a thread that is sufficiently thicker than the weft thread 5 of the tubular woven fabric 6.

The weave structure of the tubular woven fabric 12 is not particularly limited, and any suitable structure can be used.
Plain weave, twill weave, ridge weave and the like are suitable. Further, it is preferable that the tubular woven fabric 12 be fitted inside the tubular woven fabric 6 in a loose state.

The material of the airtight layer 3 differs depending on the type of the pipeline, and one having excellent durability is used depending on the type of fluid passing through the pipeline, but as a general-purpose material, a thermoplastic polyester is used. Examples include elastic resins and polyolefin resins.

Next, FIG. 3 shows an embodiment of the invention of claim 2. In the fiber layer 2 in this embodiment, a tubular non-woven fabric 15 is fitted between the tubular woven fabric 6 and the tubular woven fabric 12 in the first aspect of the invention.

As the tubular nonwoven fabric 15, a nonwoven fabric of synthetic fiber yarn such as polyester can be used, and a nonwoven fabric of high rigidity fiber such as glass fiber can also be used. The tubular non-woven fabric 15 may be a non-woven fabric which is formed into a tubular form from the beginning, or may be formed by rolling a sheet-shaped non-woven fabric and joining both edges to form a tubular form. .

In the above description, the lining material 1
Has been described as being used in a method of lining it upside down by inserting it into a conduit, and therefore has been described as having an airtight layer 3 formed on the outer surface of the fiber layer 2. In the case of using in a method of pulling 1 into the pipe line without turning it over, the relationship between the inside and outside is completely opposite to the above, and the airtight layer 3 is formed on the inner surface of the fiber layer 2. Should be.

Further, in the following description, the description given so far will be followed and the description will be given as an inner lining material that is turned inside out and inserted. However, if the lining material is not turned inside out, it should be appropriately changed and understood.

[0038]

In the present invention, the resin is cured while the fiber layer 2 is impregnated with the curable resin and pressed against the inner surface of the conduit. Then, the fiber layer 2 and the resin form a tube having an FRP structure inside the conduit.

In the curved pipe portion of this pipe, the warp threads 4 and 13 of the portion of the lining material 1 along the outer side of the curved pipe.
Is highly stretchable, the lining material 1 expands and contracts in the lengthwise direction and properly follows the curved pipe portion.

When the pipeline breaks due to an earthquake or vibration, the lining material 1 can extend in the lengthwise direction, so that the above-mentioned FRP formed in the pipeline is formed.
The pipe is peeled off from the inner surface of the pipeline, ensuring an intact flow path in the pipeline, and having seismic isolation. In addition, this FRP tube has a fiber layer 2
Since the high-rigidity fibers are arranged in the horizontal direction, sufficient pressure resistance is exhibited, and the internal pressure does not cause excessive diameter expansion, and damage to the pipeline is not expanded.

Further, in the state where the fiber layer 2 is impregnated with the reaction-curable resin and hardened to form the lining layer, high rigidity fibers are used in the circumferential direction, so that the bending elastic modulus in the circumferential direction of the lining layer is increased. It is high and the FRP pipe is not crushed by external pressure. Therefore, the external pressure shape retention property is excellent.

[0042]

As described above, according to the present invention, all the performances such as the seismic isolation, the external pressure-retaining property, and the small diameter expansion required for the liner lining material are satisfied. In addition, since these requirements are met without increasing the thickness of the lining layer more than necessary, the manufacturing thereof is simple and the lining work can be easily performed with a small fluid pressure.

Since high-strength fibers having a large strength in the circumferential direction are used, even if the density of the weft thread becomes coarse due to the expansion of the lining material 1, sufficient pressure resistance can be ensured and the diameter It does not expand and damage the pipeline and is not crushed by external pressure.
Since it is not necessary to dispose the weft threads excessively, the extensibility in the length direction of the fiber layer 2 can be sufficiently ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lining material of the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing an embodiment of the invention of claim 1;

FIG. 3 is a partially enlarged cross-sectional view showing an embodiment of the invention of claim 2 1 Lining material 2 Fiber layer 3 Airtight layer 4 Warp yarn 5 Weft yarn 6 Tubular woven fabric 12 Tubular woven fabric 13 Tubular woven warp yarn 14 Tubular Weft yarn 15

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 27/12 B32B 27/12 D03D 3/02 D03D 3/02 // B29K 21:00 101: 00 105: 08 B29L 9:00 23:00 (72) Inventor Masahiro Seshita 2-24-12 Koshienguchi, Nishinomiya-shi, Hyogo (56) References: 61-31724 (JP, U) JP-B 63- 40664 (JP, B2)

Claims (2)

(57) [Claims] 1. A warp yarn having a high elasticity is used as a warp yarn, and the warp yarn and the weft yarn are woven in a tubular shape to form a tubular woven fabric, and a rubber is provided on a surface corresponding to an inner surface when the tubular woven fabric is lined. Alternatively, an airtight layer of synthetic resin is formed, and a warp yarn made of highly stretchable yarn and a weft yarn made of high-rigidity fiber yarn are woven in a tubular shape on the side of the tubular woven fabric that faces the duct. the tubular fabric is fitted, the tubular nonwoven fabric between the cylindrical fabric and a tubular fabric
Pipe liner, characterized by being fitted with Wherein the weft of the tubular fabric, and characterized in that sufficiently thicker than weft tubular fabric, 請
Liner lining material according to claim 1